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**WARNING: SPOILERS AHEAD**
Bird Box has been a success, there's no doubting that. It's broken Netflix records with over 45 million views, and some people have been left 'terrified' while others thought they were genuinely 'trippin'' on seeing Machine Gun Kelly's cameo. (Sadly, yet quite understandably, MGK's rival Eminem didn't make an appearance.)
The ending may have been surprisingly cheery - well, relative to the grimness that came before it. But it could have been a hell of a lot worse if the film's production staff had followed the book it was based on to the letter. And it would have been pretty damn dark.
The difference is all in the conclusion. In the film Malorie, otherwise known as 'that lady from Bird Box' (SANDRA BULLOCK, FFS), reached the sanctuary with Girl and Boy after a mammoth (and presumably pretty dark) river trek.
Once there they find people roaming the grounds, including Malorie's physician, Dr Lapham. If you watch closely, a few residents are blind and using guide dogs or sticks as aids. The viewer never finds out anything about them.
But it's a hopeful place with children playing and birds singing.
The book's ending is quite different, however - while it's still relatively cheery, it's much darker.
As Malorie and the kids get inside they find that the people there have all blinded themselves to stay safe.
Wondering why they left that detail from the ending? Well, the film's director, Susanne Bier, explained that most of her films end on an uplifting note.
The Mirror reported that she said: "The movie is slightly more positive. The movie is, in many aspects, different from the book, but it's also very rooted in the book.
Took off my blindfold this morning to discover that 45,037,125 Netflix accounts have already watched Bird Box - best first 7 days ever for a Netflix film! pic.twitter.com/uorU3cSzHR
- Netflix Film (@NetflixFilm) December 28, 2018
"The book also has a kind of positive ending and I would not have wanted to do an apocalyptic movie that didn't have a hopeful ending. In a way, pretty much everything I've done has had some sort of a hopeful ending.
"I'm not particularly interested for the audience to leave, from the cinema or their own screen, with a kind of completely bleak point of view. That's not really what I believe in."
Fair play to her, with the success of the film she's clearly doing something right.
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